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test(build): pin shrink-guard safety and shared-stub survival for orphan sweep (#2807)

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Documents the target-only invariant that makes a single sweep pass sufficient,
and adds two tests: the sweep does not trip the #479 shrink guard (swept
source-less orphans count as explained loss), and a stub still referenced by a
surviving file is not swept. Also adds the CHANGELOG entry.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
safishamsi
2026-08-17 15:33:34 +01:00
co-authored by Claude Opus 4.8
parent ab73657432
commit 795102cc28
3 changed files with 37 additions and 0 deletions
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tests/test_prune_sweeps_orphans.py
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@@ -153,3 +153,33 @@ def test_a_prune_that_matches_nothing_sweeps_nothing(tmp_path):
def test_pruning_every_file_leaves_an_empty_graph(tmp_path):
G = _prune(_corpus_graph(), tmp_path, ["a.py", "b.py"])
assert G.number_of_nodes() == 0, sorted(G.nodes)
def test_sweeping_an_orphan_does_not_trip_the_shrink_guard(tmp_path):
"""The #479 shrink guard raises on unexplained node loss. Swept orphans are
source-less, so they must be treated as explained: build_merge completes
(does not raise) and returns the pruned graph with the orphan gone."""
# build_merge itself runs the guard; this pruning both a file AND sweeping
# its stranded stub must not raise.
G = _prune(_corpus_graph(), tmp_path, ["a.py"])
assert "mod_a_path" not in G.nodes # swept orphan
assert "mod_b_keep" in G.nodes # unrelated file survives
def test_a_stub_referenced_by_a_surviving_file_is_not_swept(tmp_path):
"""A stub shared by two files must survive when only one referrer is pruned
(single-pass sweep only removes it once it is genuinely degree 0)."""
nodes = [
{"id": "mod_a_run", "label": "run()", "file_type": "code", "source_file": "a.py"},
{"id": "mod_b_run", "label": "run()", "file_type": "code", "source_file": "b.py"},
{"id": "ext_path", "label": "Path", "file_type": "code"}, # shared external stub
]
edges = [
{"source": "mod_a_run", "target": "ext_path", "relation": "references",
"confidence": "EXTRACTED", "source_file": "a.py"},
{"source": "mod_b_run", "target": "ext_path", "relation": "references",
"confidence": "EXTRACTED", "source_file": "b.py"},
]
G = _prune(build_from_json(_extraction(nodes, edges)), tmp_path, ["a.py"])
assert "ext_path" in G.nodes, "stub still referenced by b.py must not be swept"
assert "mod_b_run" in G.nodes